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I can only comment for 2000mm (8 inch SCT scope),1200mm (Takahashi FS152 and TEC180FL), 819mm (AP130GT), 630mm (CFF105 F6).
I have also viewed through an AP140 F7.7 so 1078mm.
Ethos 13mm worked really well on the TEC180 at 1260mm
AP130GT 819mm, 3.5mm Nagler is pushing it a bit so I would start at 5mm (floaters appear) even 9 or 10mm. Morpheus 6.5mm seems just about right for max magnification. 9 and 10mm works well for usual high mag, 17.5 is a nice wide field but not too wide, 20mm wide angle 100degree is very wow.
30mm is good for nice widefields and for locating objects - cruising.
FS152 1260mm focal length, worked well with Panoptic 19mm and 22mm T4 Nagler was just wow.
So really for focal lengths 630 to 1260mm its 9/10mm, 12.5, 14, 17.5, 20,22, 30.
So 9-30mm with 17.5 -20 the sweet spot.
2000mm best view was 19mm Panoptic and 26mm plossl.
Greg.
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